:root {
  --primary: #2B579A;
  --primary-dark: #1F3864;
  --primary-light: #E8F0FE;
  --accent: #4472C4;
  --bg: #F5F7FA;
  --card-bg: #FFFFFF;
  --text: #333333;
  --text-secondary: #595959;
  --text-light: #8C8C8C;
  --border: #E0E5EC;
  --border-dark: #B4C6E7;
  --success: #52C41A;
  --warning: #FAAD14;
  --danger: #FF4D4F;
  --info: #1890FF;
  --shadow: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-lg: 0 4px 16px rgba(0,0,0,0.1);
  --radius: 8px;
  --radius-sm: 4px;
  --header-height: 56px;
  --sidebar-width: 220px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.6;
}

/* ===== Login ===== */
.login-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: linear-gradient(135deg, #1F3864 0%, #2B579A 50%, #4472C4 100%);
}
.login-card {
  background: #fff;
  border-radius: 12px;
  padding: 40px 36px;
  width: 380px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}
.login-card .logo {
  text-align: center;
  margin-bottom: 28px;
}
.login-card .logo h1 {
  font-size: 22px;
  color: var(--primary-dark);
  margin-bottom: 4px;
}
.login-card .logo p {
  font-size: 12px;
  color: var(--text-light);
}
.login-form .form-group {
  margin-bottom: 18px;
}
.login-form label {
  display: block;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 6px;
  font-weight: 500;
}
.login-form input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  transition: border-color 0.2s;
}
.login-form input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(68,114,196,0.1);
}
.login-form button {
  width: 100%;
  padding: 12px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s;
}
.login-form button:hover { background: var(--primary-dark); }
.login-form .hint {
  text-align: center;
  margin-top: 16px;
  font-size: 12px;
  color: var(--text-light);
}
.login-error {
  background: #FFF1F0;
  border: 1px solid #FFCCC7;
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  margin-bottom: 16px;
  font-size: 13px;
  color: var(--danger);
  display: none;
}

/* ===== Layout ===== */
.app { display: none; min-height: 100vh; }
.app.show { display: flex; }

.sidebar {
  width: var(--sidebar-width);
  background: var(--primary-dark);
  color: #fff;
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  z-index: 100;
}
.sidebar-header {
  padding: 16px 18px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.sidebar-header h2 {
  font-size: 15px;
  font-weight: 600;
}
.sidebar-header p {
  font-size: 11px;
  opacity: 0.6;
  margin-top: 2px;
}
.sidebar-nav {
  flex: 1;
  padding: 12px 0;
  overflow-y: auto;
}
.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  color: rgba(255,255,255,0.7);
  cursor: pointer;
  font-size: 14px;
  transition: all 0.2s;
  border-left: 3px solid transparent;
}
.nav-item:hover {
  color: #fff;
  background: rgba(255,255,255,0.05);
}
.nav-item.active {
  color: #fff;
  background: rgba(255,255,255,0.08);
  border-left-color: #fff;
}
.nav-item .icon {
  font-size: 16px;
  width: 20px;
  text-align: center;
}
.sidebar-footer {
  padding: 12px 18px;
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 12px;
  opacity: 0.5;
}

.main {
  flex: 1;
  margin-left: var(--sidebar-width);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.topbar {
  height: var(--header-height);
  background: #fff;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  position: sticky;
  top: 0;
  z-index: 50;
}
.topbar-left h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--primary-dark);
}
.topbar-left p {
  font-size: 12px;
  color: var(--text-light);
}
.topbar-right {
  display: flex;
  align-items: center;
  gap: 16px;
}
.user-info {
  display: flex;
  align-items: center;
  gap: 8px;
}
.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 600;
}
.user-name {
  font-size: 13px;
  font-weight: 500;
}
.user-role {
  font-size: 11px;
  color: var(--text-light);
}
.btn-logout {
  padding: 6px 14px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.2s;
}
.btn-logout:hover { border-color: var(--danger); color: var(--danger); }

.content {
  flex: 1;
  padding: 24px;
  overflow-y: auto;
}

/* ===== Cards ===== */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  margin-bottom: 20px;
}
.card-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--primary-dark);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.card-title .actions {
  display: flex;
  gap: 8px;
}

/* ===== Stat cards ===== */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}
.stat-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  border-top: 3px solid var(--primary);
}
.stat-card.green { border-top-color: var(--success); }
.stat-card.orange { border-top-color: var(--warning); }
.stat-card.red { border-top-color: var(--danger); }
.stat-card .label {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 4px;
}
.stat-card .value {
  font-size: 32px;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.2;
}
.stat-card.green .value { color: var(--success); }
.stat-card.orange .value { color: var(--warning); }
.stat-card.red .value { color: var(--danger); }
.stat-card .desc {
  font-size: 11px;
  color: var(--text-light);
  margin-top: 4px;
}

/* ===== Table ===== */
.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-sm);
}
table.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
table.data-table th {
  background: var(--primary);
  color: #fff;
  padding: 10px 12px;
  text-align: left;
  font-weight: 500;
  white-space: nowrap;
  position: sticky;
  top: 0;
}
table.data-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
table.data-table tr:hover td {
  background: var(--primary-light);
}
table.data-table .editable {
  cursor: pointer;
}
table.data-table .editable:hover {
  background: var(--primary-light);
  border-radius: 2px;
}

/* ===== Badges ===== */
.badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
}
.badge-high { background: #FFE7E7; color: #CF1322; }
.badge-medium { background: #FFF7E6; color: #D46B08; }
.badge-low { background: #F6FFED; color: #389E0D; }
.badge-done { background: #F6FFED; color: #389E0D; }
.badge-progress { background: #E6F7FF; color: #096DD9; }
.badge-pending { background: #F5F5F5; color: #8C8C8C; }
.badge-decision { background: #FFF1F0; color: #CF1322; }

/* ===== Calendar grid ===== */
.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.cal-header {
  background: var(--accent);
  color: #fff;
  padding: 8px;
  text-align: center;
  font-weight: 500;
  font-size: 13px;
}
.cal-header.weekend { background: #8C8C8C; }
.cal-cell {
  background: #fff;
  min-height: 110px;
  padding: 6px 8px;
  cursor: pointer;
  transition: background 0.15s;
  overflow-y: auto;
}
.cal-cell:hover { background: var(--primary-light); }
.cal-cell.other-month { background: #FAFAFA; color: var(--text-light); }
.cal-cell.weekend { background: #FAFAFA; }
.cal-cell.today {
  border: 2px solid var(--primary);
}
.cal-day-num {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 4px;
}
.cal-entry {
  font-size: 11px;
  padding: 2px 6px;
  margin-bottom: 2px;
  border-radius: 3px;
  background: var(--primary-light);
  color: var(--primary-dark);
  line-height: 1.4;
  cursor: pointer;
}
.cal-entry.routine { background: #FFF7E6; color: #D46B08; }
.cal-entry.plan { background: #E6F7FF; color: #096DD9; }
.cal-entry.learn { background: #F6FFED; color: #389E0D; }
.cal-entry.temp { background: #FFF0F6; color: #C41D7F; }
.cal-entry.done { text-decoration: line-through; opacity: 0.6; }

/* ===== Modal ===== */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.45);
  z-index: 200;
  align-items: center;
  justify-content: center;
}
.modal-overlay.show { display: flex; }
.modal {
  background: #fff;
  border-radius: var(--radius);
  width: 560px;
  max-width: 90vw;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}
.modal-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.modal-header h4 {
  font-size: 16px;
  color: var(--primary-dark);
}
.modal-close {
  background: none;
  border: none;
  font-size: 20px;
  cursor: pointer;
  color: var(--text-light);
  padding: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
}
.modal-close:hover { background: var(--border); }
.modal-body {
  padding: 20px;
}
.modal-footer {
  padding: 12px 20px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

/* ===== Forms ===== */
.form-row {
  display: flex;
  gap: 12px;
  margin-bottom: 14px;
}
.form-row > .form-group { flex: 1; }
.form-group {
  margin-bottom: 14px;
}
.form-group label {
  display: block;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 4px;
  font-weight: 500;
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-family: inherit;
  transition: border-color 0.2s;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(68,114,196,0.1);
}
.form-group textarea {
  resize: vertical;
  min-height: 60px;
}

/* ===== Buttons ===== */
.btn {
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: #fff;
  color: var(--text);
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn-primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.btn-primary:hover { background: var(--primary-dark); color: #fff; }
.btn-danger {
  background: var(--danger);
  color: #fff;
  border-color: var(--danger);
}
.btn-danger:hover { opacity: 0.85; color: #fff; }
.btn-sm {
  padding: 4px 10px;
  font-size: 12px;
}
.btn-ghost {
  background: transparent;
  border: none;
  color: var(--text-light);
  cursor: pointer;
  font-size: 12px;
  padding: 2px 6px;
}
.btn-ghost:hover { color: var(--primary); }

/* ===== Filter bar ===== */
.filter-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.filter-bar select,
.filter-bar input {
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 13px;
}

/* ===== Toast ===== */
.toast {
  position: fixed;
  top: 20px;
  right: 20px;
  background: #333;
  color: #fff;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  z-index: 300;
  opacity: 0;
  transform: translateY(-10px);
  transition: all 0.3s;
}
.toast.show { opacity: 1; transform: translateY(0); }
.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }

/* ===== Empty state ===== */
.empty {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-light);
  font-size: 14px;
}

/* ===== Weekly summary ===== */
.weekly-grid {
  display: grid;
  gap: 16px;
}
.weekly-card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.weekly-card-header {
  background: var(--primary-light);
  padding: 10px 16px;
  font-weight: 600;
  color: var(--primary-dark);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.weekly-card-body {
  padding: 16px;
}
.weekly-field {
  margin-bottom: 12px;
}
.weekly-field-label {
  font-size: 12px;
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: 4px;
}
.weekly-field textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font-size: 13px;
  font-family: inherit;
  resize: vertical;
  min-height: 60px;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .sidebar {
    width: 60px;
  }
  .sidebar-header h2, .sidebar-header p, .nav-item span:not(.icon), .sidebar-footer { display: none; }
  .main { margin-left: 60px; }
  .content { padding: 12px; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .calendar-grid .cal-cell { min-height: 70px; }
  .cal-entry { font-size: 10px; }
}